With the growing air pollution and limitations on production, industries demand a dust-free environment. Dry scrubbers come into play to treat the polluted air from the exhaust before releasing it into the surroundings.
Unlike wet scrubbers, the discussion at hand about scrubbers that are dry says that they remove toxic affluents from the air released by industries without the use of liquid. It generates waste that is light in weight. Hence, this type of scrubber is easy to maintain. As the name suggests, this equipment operates in the industrial air without the use of moisture. These structures of scrubbing are used to do away with acid gas. The gas released after the chemical processes in industries contains toxic effluent. The toxicity in the form of Sulphur Dioxide and Hydrochloric acid is treated. This makes the air produced from combusting sources breathable.
These structures of scrubbing that are dry include 2 essential sections.
The first one is the scrubber and the 2nd one is the medium of the scrubber. The absorbent present within the device is great for the treatment of air. This is because it integrates with the exhaust air and captures the toxins.
The scrubber media which forms a major component of the system is also known as a baghouse. This is used for capturing the sorbent after cleaning the air. This method of capturing the resulting sorbent can be done in various ways. The most prominent to be used is by electrostatic adhesion.
Different scrubber media do away with pollution in a couple of ways as mentioned above. For a few applications, dry scrubbing offers the exceptional answer to manipulate the surroundings of an individual to a healthy and breathable atmosphere. It additionally smoothens the grimy air released from the exhaust streams. From doing away with toxicity from the gases to getting rid of odours, these scrubbers tend to clean the stream of air from the exhaust before being released into the surroundings.
Contrary to the wetter option of scrubbing, they are used to cast off pollution without the aid of moisture. The contaminants are treated without a moist sludge. The polluted air from the exhaust which contains particulate material in the form of fuel toxins can be easily treated using this structure.
What are the operations or functions of a dry scrubber?
The scrubbing option in a dry medium can be executed by the 3-mentioned steps:
- Cooling of the gas – The exhaust gas is cooled in this process. This is done in order to make the process easier to handle. The emission of gas when warm is difficult to treat. This step is executed with the help of a cooler that uses the technique of evaporation.
- Injection of a reagent – This step reduces the toxins from the air. The majority of the dangerous additives are eliminated in this process. The advantage of using this type of scrubber is because the contents used to be neutral in nature. The dry reagents, being of neutralizing characteristic, are used in order to remove the toxins. Reagent powder is a substance that is mixed with polluted gas at high pressure. Thus, the direction of these neutral reagents at an excessive pressure helps in the separation of harmful contents.
- Filtration – This process involves the cleaning of spent powder. The fabric filter that is kept deep down in the structure of a dry scrubbers collects the powder used for scrubbing. Meanwhile, clean air is sent through the vents. This, being a cost-effective process, can utilize the spent powder for dry scrubbing again after deep cleaning.
Briefly, dry scrubbers remove toxins like HCl in order to make the air clean after being released from the industry.